JP2674425B2 - Overlock sewing machine cross plate opening / closing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cross plate opening / closing device for an overlock sewing machine which opens / closes a cross plate rotatably supported by a sewing machine main body to the outside of the main body.

[0002]

2. Description of the Related Art Conventionally, in this type of overlock sewing machine, a cross plate must be opened outward (left side) of the main body when threading the lower looper and adjusting the cloth feed amount. A conventional cross plate opening / closing device is, for example, as shown in Japanese Utility Model Publication No. 41-7159, a crossing plate is pivotally fixed to a cross plate, and a hook urged by a coil spring is used as a hooking pin implanted in the main body. The one that locks to close the cross plate, or, as disclosed in Japanese Utility Model Publication No. 56-21186, the engagement of the tip of the opening lever axially supported by the cross plate along the front edge of the cross plate. It has been used that the stopper is biased upward by a spring and the locking portion is locked to the slope of the stopper fixed to the main body to close the cross plate.

In the former case, the opening pin with which one end of the hook is engaged is pushed to open the hook retained by the hooking pin to open the cross plate. In the latter case, the opening lever is opened. The tip of the cross plate is lowered to release the engagement with the stopper to open the cross plate.

[0004]

As described above, the conventional cross plate opening / closing device merely locks the cross plate on the hooking pin or the stopper. In a normal cross plate, a support shaft provided at the right rear part is rotatably supported by the main body,
When closed, the lower right front side of the cross plate is placed on the needle plate support fixed to the main body.
Since the left end of the cross plate, especially the left front part, is not supported and is in a free state, when the sewing machine is driven and the main body vibrates, the front side of the cross plate largely shakes to increase the vibration. Before the cross plate, the worker is sewing while pressing the cloth, and the vibration of the cross plate causes a discomfort to the worker and makes it difficult to sew, which is a factor that hinders the work efficiency.

Therefore, the present invention has been made in order to solve the above-mentioned problems, and suppresses the vibration of the cross plate from greatly increasing in front of the cross plate during operation of the sewing machine, and reduces the vibration of the cross plate. It is intended to provide an opening / closing device.

[0006]

In order to achieve the above object, the present invention provides a support shaft provided at the rear portion of a cross plate.
Is rotatably supported on the sewing machine body, in a cross plate switchgear overlock sewing machine for opening and closing the cross-plate outwardly about its pivot, fixed to the sewing machine the <br/> body, the cross in front of the cross plate during plate closure, a first support member for supporting the lower surface of the side remote from the sewing machine main body, the upper surface of the sewing machine body
When the cross plate is closed,
Below the side near the sewing machine body, in front of the splat
A second support member for supporting a surface and a locking pin provided on the sewing machine main body, which is attached to the lower surface of the cross plate in the vicinity of a portion supported by the first support member, or
By providing a spring member for biasing the cross plate engages with the first support member downward, the press-fitted onto the lower surface is the supporting members of the said resiliently said spring member when the cross plate closed cross plate It is characterized by doing.

[0007]

In the cross plate opening / closing device of the overlock sewing machine of the present invention having the above-mentioned structure, when the cross plate is closed, the spring member attached to the cross plate becomes the locking pin of the main body or the first supporting member. The cross plate is locked and held closed, and the elastic force of the spring member allows the cross plate to come to the left and right sides of the front side (sewing machine main body).
Lower surface side) close to the spaced side with the sewing machine main body from the,
It is crimped to the first or second support member, respectively .

Here, the second support member is the upper surface of the sewing machine main body.
It is fixed on top of it. Therefore, the second support member
The lower surface on the side close to the sewing machine body in front of the cross plate
Can be supported very stably. Also, spring
The member is supported by the first supporting member on the lower surface of the cross plate.
Since it is attached near the area where
Acts more effectively near the first support member. For this reason,
The first support member is from the sewing machine body in front of the cross plate.
The lower surface of the separated side is extremely safe as with the second support member.
Can be fixed and supported.

Therefore, the lower surface of the front side of the cross plate is evenly brought into close contact with both supporting members, and the front portion of the cross plate is not largely shaken to increase vibration. Moreover, the spring part
Since the material is provided on the side of the cross plate, it is relatively
Even if a large spring member is used, the
Work performed on the thin body (for example, to the lower looper
It does not hinder the threading work). Therefore, the spring member
The elasticity of the cross plate can be
The lower surface adheres well to both support members. Therefore, the above vibration
Is very well suppressed.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a first embodiment, and FIG.
FIG. 2 is a perspective view and a cross-sectional view of the periphery of the cross plate of the overlock sewing machine. In FIG. 1, as is well known, a cross plate 1 has a support shaft 2 projecting from a lower surface of a right rear portion thereof which is swingably supported by a sewing machine main body 3, and the cross plate 1 is outwardly centered on the support shaft 2. It can be opened and closed (to the left in Fig. 1). A leaf spring 5 is fixed by a screw 6 to a bracket 4 spot-welded to the front lower surface 1a of the cross plate 1. On the front part of the sewing machine body 3, a locking pin 7 is planted in the front direction. An engaging portion 5a that engages with the engaging pin 7 is formed in the middle of the leaf spring 5, and a finger hook portion 5b that releases the engagement and opens the cross plate 1 is provided at the tip end portion of the leaf spring 5. Is bent as shown in FIG.

On the front right upper surface of the sewing machine main body 3, a needle plate support base 9 having two rubbers 8 adhered to the upper surface recess 13 is fixed,
The surface of the needle plate 10 attached to the needle plate support 9 is flush with the surface of the cross plate 1. Sewing machine body 3
An L-shaped support member 11 is attached to the left side surface in front of by two bolts 12 so that the upper surface is horizontal. Therefore, when the cross plate is closed, the lower left side in front of the cross plate 1 is supported by the support member 11, and the lower right side is supported by the two rubbers 8 of the needle plate support 9.

Due to this structure, the cross plate 1
Is closed, the engaging portion 5a of the leaf spring 5 engages with the engaging pin 7 to prevent the cross plate from rotating to the left due to the elastic force of the leaf spring, and the lower surface of the front side of the cross plate 1 is supported. The member 11 and the rubber 8 of the needle plate support 9 are pressure-bonded.
The cross plate 1 is opened by pushing the finger-holding portion 5b at the tip of the leaf spring 5 to the left, and when pushing the finger-holding portion 5b to the left, the leaf spring 5 disengages from the flexible locking pin 7 and moves to the left. open. The leaf spring 5 is not on the sewing machine main body 3 side.
Since it is provided on the side of the cross plate 1,
Even when using a large one, when opening the cross plate 1
Work to be performed on the sewing machine main body 3 (for example, not shown)
It does not hinder the operation of threading the lower looper. Follow
Thus, the elasticity of the leaf spring 5 can be secured well.

The vertical vibrations of the front left end portion and the front right end portion of the cross plate 1 measured with the support member 11 of the above embodiment attached and with the support member 11 removed are shown in FIGS. On the street. The front left end of FIG. 3 measures 15 mm from the left end face of the cross plate 1 and 15 mm from the front end face, and the front right end of FIG. 4 measures 15 mm from the right end face of the cross plate 1 and 15 mm from the front end face. did. The solid lines in FIGS. 3 and 4 are measured values of vibration acceleration (G value) for each rotation speed of the sewing machine drive shaft, and the dotted lines are measured values when the support member 11 is removed (comparative example). Is. The dashed-dotted line diagram in FIG. 3 shows the measurement result of the vertical vibration on the support shaft 2 of the cross plate 1 when the support member 11 is not provided. Even if the support member 11 was attached to the support shaft 2, there was almost no change.

The result of this measurement shows that the front left end of the cross plate without the supporting member 11 is 6000 rpm.
At 6 . It shows the maximum value of 7G, and the front right end is 600
When the speed exceeds 0 rpm, the vibration suddenly increases. When the left end of this side is vibrated with an impulse hammer and frequency analysis is performed, there is a natural frequency of 100 to 120 HZ, and resonance occurs at the primary component of the rotational speed of the drive shaft, and 6000 to
It is considered that large vibration occurs at 7,000 rpm.
On the other hand, when the support member 11 was attached, the vibration acceleration gradually increased as the rotation speed of the sewing machine drive shaft increased at both the front left end and the front right end, but no abnormal phenomenon occurred.

When the support member 11 is not provided and when the support member 11 is not provided.
When comparing the maximum values of vertical vibration up to 7500 rpm (maximum rotation speed of this sewing machine) when there is, the front left end is 6 . 7G is 4 . 7G, the front right edge is 6 . 8
G is 3 . It is 5G. When the support member 11 is attached, the vibration acceleration is reduced by about 30 to 50%, which is a small vibration that is less than twice that of the support shaft portion of the cross plate 1. It is considered that the vibration at the front right end is also small because the vibration mode in which the motion of the right end is in a phase opposite to that of the motion of the left end suppresses the shake at the left end, thereby reducing the shake at the right end.

In any case, if the support member 11 is fixed to the sewing machine main body 3 and the front left and right sides of the cross plate 1 are pressure-bonded to the support member 11 and the rubber 8, the cross plate 1 is measured. It is shown that the vertical vibration of is significantly suppressed. Next, FIG. 5 showing the second embodiment.
This will be described with reference to FIG. This second embodiment is similar to the first embodiment.
An example in which a part has a first support member of the needle plate abutment 9 and the support member 11 so as to be integrated needle plate abutment 19 of the embodiment, except it is the same as the first embodiment.

The needle plate support 19 is a support portion 2 extending to the front left side.
0 is formed, and this portion is a slightly higher flat surface so that the lower surface of the cross plate 1 is in close contact with the rubbers 8 on the same plane. Like the needle plate support 9, the needle plate support 19 is attached to the upper surface of the sewing machine main body 3. The result of measuring the vertical vibration of the upper surface of the cross plate 1 of the second embodiment was substantially the same as that of the first embodiment.

Next, a third embodiment shown in FIG. 7 will be described. The needle plate support 21 has support portions 22 and 23 whose left front and right front are flush with each other. A leaf spring 25 attached to the lower surface of the cross plate 1 via a bracket 24.
However, the lower surface 21a of the needle plate support 21 extending to the left front is pressed and the lower surface of the cross plate 1 is pressed by the elastic force to the support portions 22 and 23 of the needle plate support 21 . A plate spring 25 only the pressure contact of the lower surface 21a of the needle plate abutment 21, can suppress the vibration of the cross plate 1 be clamped needle plate abutment 21 in the leaf spring 25 and the cross plate 1 into a small vibration.

A hook lever 27 is pivotally supported on a shaft pin 26 planted in the sewing machine main body 3, and a torsion coil spring 28 mounted on the shaft pin 26 urges the hook lever 27 to rotate counterclockwise. . The locking pin 27 planted in the cross plate 1 is engaged with the locking portion 27a of the hook lever 27 to close the cross plate 1. When the finger hook 27b is pushed to open the cross plate 1 and the finger is released, the hook lever 27 comes into contact with the stop pin 30 planted in the sewing machine main body 3. Therefore, in this embodiment, the hook lever 27 locks the cross plate 1 for opening and closing.

In addition, also in the third embodiment, the result of measuring the vertical vibration of the upper surface of the cross plate was substantially the same as that of the first embodiment. Also, if a locking member is provided to support the lower front surface of the left side of the cross plate, the cross plate will be deformed or damaged even if an operator applies a large load or impact near the left end of the front side of the cross plate. This is preferable in terms of maintenance of the sewing machine because it can prevent

[0021]

As described above, according to the present invention, when the sewing machine is operated, the front of the cross plate is not greatly shaken to increase the vibration, and the vibration of the cross plate can be suppressed to a small vibration. Comfortable sewing can be performed with almost no vibration of the cross plate, and the sewing efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a cross plate opening / closing device showing a first embodiment of the present invention with a cross plate opened.

2 is a cross-sectional view of the apparatus of FIG. 1 in a cross plate closed state.

FIG. 3 is a vibration diagram in front of the left side of the cross plate.

FIG. 4 is a vibration diagram on the right front side of the cross plate.

FIG. 5 is a perspective view of an overlock sewing machine including a cross plate opening / closing device of a second embodiment.

6 is a cross-sectional view of the cross plate opening / closing device of FIG.

FIG. 7 is a cross-sectional view of a cross plate opening / closing device of a third embodiment.

[Explanation of symbols]

1 Cross Plate 2 Spindle 3 Sewing Machine Main Body 5 Leaf Spring (Spring Member) 7 Locking Pin 8 Rubber (Second Support Member) 11 Support Member (First Support Member) 20 Support Part ( First Support Member) 22 Support Part ( 1st support member) 23 Support part (2nd support member) 25 Leaf spring (spring member)

Continuation of the front page (56) References JP-A-62-201181 (JP, A) Actually opened 55-41130 (JP, U) Actually opened 54-4160 (JP, U)

Claims (1)

(57) [Claims] 1. A support shaft provided in the rear of the cross plate Mi
Rotatably is supported by a thin body, the cross plate switchgear overlock sewing machine for opening and closing the cross-plate outwardly about its pivot, the secured to the sewing machine body, said cross at the cross plate closure Separate from the sewing machine main body in front of the plate.
The first support member for supporting the lower surface on the spaced side and the upper surface of the sewing machine main body are overlapped and fixed, and
When the rate is closed, the
A second support member that supports the lower surface on the side close to the main body, and a lower surface of the cross plate that is supported by the first support member.
Is attached in the vicinity of the portion to be, and a spring member for biasing the click <br/> loss plate engaged with the locking pin or the first support member provided on the sewing machine body downward, the by providing cross plate switchgear overlock sewing machine the underside of the said resiliently said spring member when the cross plate closed cross plate characterized by crimping to the each supporting <br/> support member.